@article{702382,
title = {On the regularity and non-regularity of elliptic and parabolic systems},
booktitle = {Equadiff 7},
series = {GDML\_Books},
publisher = {BSB B.G. Teubner Verlagsgesellschaft},
address = {Leipzig},
year = {1990},
pages = {28-36},
zbl = {0727.35029},
url = {http://dml.mathdoc.fr/item/702382}
}
John, O.; Stará, J. On the regularity and non-regularity of elliptic and parabolic systems, dans Equadiff 7, GDML_Books, (1990), pp. 28-36. http://gdmltest.u-ga.fr/item/702382/